摘要
湖泊沉积物粒度组成及特征主要受沉积物沉积时的动力条件和搬运特征控制,从而可以记录湖面水文信息的变化。基于对东南沿海高海拔湖泊斗湖表层和流域范围表层沉积物样品粒度的测试,利用沉积物粒度多组分分析方法,分析了表层沉积物的组分特征,探讨了斗湖表层沉积物粒度变化的环境意义。结果显示,斗湖表层沉积物主要为黏土质粉砂,沉积形式主要以悬浮沉积为主。其次,粒度频率曲线呈多峰特征,利用多组分分析方法从湖泊样品中解析出5个组分,其粒径分别为0.64~0.74μm,2.2~4.0μm,10.5~16.4μm,61~110μm和265~436μm,而流域沉积物样品仅存在前4个组分。再次,通过与汇水盆地表层沉积物粒度特征的对比,推断出斗湖沉积物粒度特征主要受湖泊南北方向水动力变化控制,揭示出斗湖沉积物是重建东南沿海地区古环境演化的潜在载体。
Lake hydrological information could be recorded by the composition and characteristics of grain size in lacustrine sediments,which was controlled by the dynamic conditions and transport characteristics in lake system. By using Mastersizer 2000,the multimodal characteristics of grain size distribution of surface sediments from Lake Douhu and its drainage basin were measured and carefully analyzed. The standard patterns and their grain size characteristics of various sediments were systemically summarized,and the relationship between the grain size and environmental significance was investigated. It was found that the surface sediments of the lake are mainly composed of clay silt,which was mainly transported by suspension. Secondly,the multimodal characteristic of grain size distributionis a common feature in all sediments. Five modes（median size were 0. 64 ～ 0. 74 μm,2. 2 ～ 4. 0 μm,10. 5 ～ 16. 4 μm,61 ～ 110 μm and 265 ～ 436 μm） in grain size distribution were isolated from the lake sediment samples by multi-mode analysis,while there were the former 4 modes in sediments from drainage basin. Thirdly,it is inferred that the grain size characteristics of the sediments are controlled by the hydrodynamic changes from north side to south side in lake,which reveals that the sediments in the lake are the potential carriers for rebuilding the paleo-environmental evolution in Southeastern China.
作者
曹奇
雷国良
蔡炳贵
张江燕
CAO Qi1＇2, LEI Guoliang1,2,3., CAI Binggui1,2,3, ZHANG Jiangyan1,2(Funded by Ministry- of Science and Technology and Fujian Normal University, Fuzhou 350007, China)
出处
《亚热带资源与环境学报》
2018年第1期81-87,共7页
Journal of Subtropical Resources and Environment
基金
国家自然科学基金资助项目(41501218
41661144021)
福建省科技厅自然科学基金项目(2015R1101029-8)
福建师范大学校创新团队项目(IRTL1705)
关键词
表层沉积物
粒度
多组分分析
福建斗湖
Surface sediment
grain size
multimodal characteristics of grain size distribution
LakeDouhu, Fujian
